Please note, that conches only drop if you manage to catch a special item instead of a fish, e.g. an espresso machine or a pine cone. Conches are not awarded for catching normal fish. Our bestseller shop also offers a Magnetic lure, which allows for a 50% chance of catching a special item. With a little luck, you should be able to gather some conches.
The easiest way to obtain them, however, is by producing Fish fingers in the Seafood restaurant. This recipe requires only corn and common (white) fish fillets.